Conceptual: Address attribute

I am currently writing a documentation using the conceptual help of Sandcastle.
All is well and cool, except one: Centering images.

I wish I could center some large images, but could still not find any means.
I was looking for ways of doing this without a change to the schema, since that
might involve a lot. I used the quote tag on some since this results in
HTML blockquote, giving it some indentation.

After trying I found this address attribute, which is optional but available in
most tags and is defined as ID. Now, if the transformation system could pass
this IDs to the HTML output as HTML tag id, we could define css id selectors
to style it.

Any possibility of implementating this without extensive change to the currrent
transformers?